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Author Topic: Difference between a vertical pole and a vertical wire antenna  (Read 1495 times)
KB3FFH
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Posts: 162




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« on: June 27, 2012, 06:03:09 AM »

I am looking for the main differences between a pole and a wire vertical antenna. Is it the bandwith?
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KI4SDY
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Posts: 1452




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« Reply #1 on: June 27, 2012, 06:50:33 AM »

Yes!  Grin
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W8JX
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Posts: 5746




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« Reply #2 on: June 27, 2012, 07:12:10 AM »

The larger the diameter of the radiator, the more broad banded it tends to be.
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K4SAV
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Posts: 1840




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« Reply #3 on: June 27, 2012, 07:13:07 AM »

It's kinda hard to stand a wire on its end.
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KI4SDY
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« Reply #4 on: June 27, 2012, 07:43:15 AM »

Not if its hanging from a tree!  Grin
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KT4EP
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Posts: 15




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« Reply #5 on: June 27, 2012, 10:03:22 AM »

You aren't going to tell much difference in the bandwidth. 
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WB6BYU
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Posts: 13231




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« Reply #6 on: June 27, 2012, 10:09:52 AM »

The fatter conductor has a wider bandwidth because the reactance doesn't change as fast.
Along with that the impedance isn't as high when the antenna is parallel-resonant (such as
a half-wave end-fed antenna.)

This makes a difference for some feeding schemes that use a transformer at the base and
claim low SWR over a wide frequency range, because that only works well when the
radiator is a large diameter (and/or the transformer is lossy.)

Also, the physical length for resonance will be a bit shorter for a larger diameter conductor.


With most antennas these are relatively small differences, and common methods of tuning
the antenna will correct for them.  A quarter wave ground plane, for example, would have
a slightly difference in overall length, but performance would be about the same.  For
some designs, however, it might make a difference:  an end-fed half wave antenna would
require a slightly different matching values for the lower impedance of the fatter tubing,
and a wire will show more variation in SWR over frequency.
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AD4U
Member

Posts: 2164




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« Reply #7 on: June 27, 2012, 10:24:04 AM »

A larger conductor will definitely have a wider bandwidth than a smaller conductor.  Whether or not the additional bandwidth is measureable or significant depends on several things (conductor diameter VS frequency is one) and may (or may not) be of any value to you.

All else being equal the larger conductor WILL NOT radiate a stronger signal than the wire.

Dick  AD4U
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